February 2016
Intermediate to advanced
382 pages
8h 1m
English
Content preview from Scala Design PatternsBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 3. Unification
Being able to understand and write good code in Scala requires developers to be familiar with the different concepts of the language. In a few places so far, we have mentioned that Scala is really expressive. To some extent, this is because there are a number of programming concepts that have been unified. In this chapter, we will focus on the following concepts:
- Functions and classes
- Algebraic data types and class hierarchies
- Modules and objects
Functions and classes
In Scala, every value is an object. Functions are first class values, which also makes them objects of their respective classes. The following figure shows the Scala unified type system and how this is achieved. It is adapted from http://www.scala-lang.org/old/sites/default/files/images/classhierarchy.png ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.